CVE-2026-9256

Estado: ModificadaCrítica (9.2)—
NGINX Plus and NGINX Open Source have a vulnerability in the ngx_http_rewrite_module module. This vulnerability exists when a rewrite directive uses a regex pattern with distinct, overlapping Perl-Compatible Regular Expression (PCRE) captures (for example, ^/((.*))$) and a replacement string that references multiple such captures (for example, $1$2) in a redirect or arguments context. An unauthenticated attacker along with conditions beyond their control can exploit this vulnerability by sending crafted HTTP requests. This may cause a heap buffer overflow in the NGINX worker process leading to a restart. Additionally, attackers can execute code on systems with Address Space Layout Randomization (ASLR) disabled or when the attacker can bypass ASLR.
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Note: Software versions which have reached End of Technical Support (EoTS) are not evaluated.
CVSS

Versión: 4.0
Vector: CVSS:4.0/AV:N/AC:H/AT:P/PR:N/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X
Puntuación base: 9.2
Probabilidad de explotación (EPSS)

Probabilidad de explotación en los próximos 30 días: 2.70%
Percentil entre todas las CVEs puntuadas: 85
Fecha de la puntuación: 5/10/2026
EPSS (Exploit Prediction Scoring System, de FIRST) estima la probabilidad de que una vulnerabilidad sea explotada en 30 días. Complementa a CVSS (impacto) y a CISA KEV (explotación confirmada).
🎯 Técnicas ATT&CK

Cómo se explota esta vulnerabilidad y qué consigue el atacante, en el lenguaje de MITRE ATT&CK.
ExplotaciónT1190 Exploit Public-Facing Applicationinitial access95 %
Impacto principalT1068 Exploitation for Privilege Escalationprivilege escalation85 %
Impacto secundarioT1059 Command and Scripting Interpreterexecution80 %
Vector de red sin autenticación (AV:N/PR:N) apunta a T1190. Heap overflow puede elevar privilegios (VC:H) o ejecutar código arbitrario, especialmente sin ASLR; impacto primario T1068, secundario T1059.
Inferido por nuestro agente de análisis a partir de la descripción oficial, el vector CVSS y la CWE, y comprobado por un supervisor. Puede contener errores.
🛡️ Mitigaciones ATT&CK que cubren estas técnicas

Privileged Account Management Execution Prevention Application Isolation and Sandboxing Exploit Protection Update Software Vulnerability Scanning
Tecnologías afectadas (12)

Debian — Debian Linux F5 — DOS F5 — Nginx Gateway Fabric F5 — Nginx Ingress Controller F5 — Nginx Instance Manager F5 — Nginx Open Source F5 — Nginx Plus F5 — WAF Redhat — Discovery Redhat — Enterprise Linux Redhat — Hardened Images Redhat — Update Infrastructure
CWE

CWE-122
CWE-122
Referencias

JSON original (NVD)

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